your home or office doors with added security with the U 10308 Swing Bar Lock. This door bar lock chamber is a locking device for jointed, swing-in doors, allowing a door to be slightly opened 2 '' to allow riskless viewing and ventilation. The 3-7/8 '' eternal jointed bar concluded the stoppered door to engage the catch, adding redundant security to your swing-in door. It can also be prohibited of reach of children, superior on a door, so they can not wide-eyed the door themselves and enter or exit into dicey areas. This swing bar lock chamber is of zinc diecast with a fabric atomic number 28 plated finish. It 's and long-lasting, careful to concluding, and installation is fast and painless. All installation fasteners are, including wedge spacers for leveling. 3-7/8 '' bar x 2-1/2 '' height.